Ore-treating- kiln



W. WINKELMAN.

ORE TREATING KILN. APPLICATION man JUNE fd. 191s.

1,319,939. Patented 0@1t.28,1919.v

' THB COLUMBIA PLANDGRAPH co.. WASHINGTON, n. C,

.UNITED sfrazrnsI PATENT lonnion WILLIAM WINKELMAN, 0F LOS ANGELES, CALIFORNIA, vASSIGNOR-OF ONEIIALF-T0 Y A. G. BUCHMANN,`OF LOS ANGELES, CALIFORNIA.

l oRE-TREATING KILN.

Specification of Letters Patent. v

Patented oct. as, 1919.

, Application led .Tune 10, 1918. Serial No.723946.

having less than forty per cent. of the` mineral therein on the dump, consequently there exist large dumps of such low grade ore which heretofore has not' been shipped on account of the expense of reducing such low grade ore.

One of the principal objects of my invention is to produce a furnace or kiln of simple form and construction in which the low grade ores of the class described may be economically and continuously deoxidizedy thereby producing a product which is suitable for concentration in the ordinary forms of concentrators. This object I accomplish by using a furnace of particular construction in which is placed the crushed ore intermixed with carbonaceous material such as saw-dust or similar material, and the body of ore and carbonaceous material heated to a sufiicient temperature to deoxidize the ore, but without melting theA metallic contents.

Other objects and advantages will appear hereinafter from the following specification.

Referring to the drawings, which are for illustrative purposes only,

Figure l is a vertical sectional view of a furnace embodying a form of my. invention.

Fig. 2 is a vertical sectional view of the furnace shown in Fig. l, on line 2 2, Fig. 1, and

Fig. 3 is a sectional plan view on line 3-3, Fig. 2. y

5 designates a front wall and 6 the rear wall of a furnace having centrally located therein a heating chamber 7 which extends vertically through the furnace, being open at the top as indicated at 8. 9, 10 and 11 each designate a series of horizontally arranged hollow tile forming conduits which extend across the chamber 7, the conduits being Supported between the chamber `'upon partitions or walls 12; The conduits munication with the rear end of the seriesA of conduits 10 througha flue 14;, the front end of thel series of conduits 10 being in open communication with the front end ofy the series of conduits 11 by means of a flue 15,`the rear end of the series of conduits llybeing in open communication with the stack flue 16 having any suitable stack 17 connected thereto.V y l The combustion chamber is provided with a suitable doorv20 through which extends an'oil burner 21 for the purpose of supplying liquid fuel to the combustion chamber. 22 designates a grate and 23 an ash chamber provided with a door 24 which may be used in case that wood or coal is used instead of liquid fuel above referred to.

Arranged below the conduits in the heating chamber 7 isa hopper 25, the lower end of which terminates in a trough 26 in which is operated a spiral'conveyer 27 for removing the contents of the hoppers here# l inabove referred to, through a pipe 2,8.

The .furnace is operated in the following manner: y

The orel to be treated is first crushed and mixed with carbonaceous material such as saw-dust orsimilar material and placed in the chamber 7. The heat is then provided by means of the burner 21 which heat passes from the combustion chamber 13, through the series ofconduits 9, to the flue 14, thence through the series of conduits 10, to the flue 15, thence through the series of conduits 11, and out the stack flue 16 to the stack. l

By conducting the heat through the mass of ore and'carbonaceous material by means of conduits as above described the mass is heated throughout and the deoxidation of the ore in the chamber takes place, the mass moving downwardly thereby permitting the continuous treatment of ore. The heat so provided is sufficient to cause a deoxidation of the ores being treated, but is not suflicient to meltthe metal content of the ores.

It is to be noted that during this heating operation that the air is excluded from the heating chamber due to the fact that the large body of material in the chamber about the conduits has a mass of fresh material in the chamber 7 above the conduits, the heat being supplied by the conduits.

As the ores are deoxidized the same are removed from the hopper 25 by means of the conveyer 26, the orc being permitted to remain in the hopper a sufficient length of time to permit the material to cool so that the same may be handled. By the use of the kiln albove described I am able to treat the low grade ores which at the present time are being thrown on the dump and place such ores in a condition to be commercially handled at a profit.

My invention plays an important part in a novel method of separating manganese ores from their gangue. rllhere exist in nature large bodies of low grade manganese ore in which the manganese dioxid is mixed with silicates. Such ore is very diiiicult to concentrate as the dioxid is friable and when crushed tends to form a powder which cannot be separated from the silicates by ordinary gravitational methods. In my new method I deoxidize the ore in the novel furnace described herein. The manganese oxid is somewhat heavier, firmer and more metallic than the dioxid and when crushed can be readily separat-ed by ordinary jigging methods from the silicates with which it is associated.

My furnace is novel in that at all times during its operation it is filled with the ore to be deoxidized mixed with carbonaceous material, and in that during this time the air is excluded from this charge which settles more or less continuously downwardly between the conduits 9 which supply the heat necessary to carry on the process. The hopper 25 and that portion of the kiln directly above it form a cooling chamber in which the hot ore is cooled before being withdrawn or exposed to air. This is very necessary as the ore is heated to a temperature of from 900 degrees C. to 1000 degrees C. in its passage between the conduits and if exposed to the air at this temperature it would rapidly reoxidize and thus nullify the main purpose of the invention.

W hat I claim is l. A kiln for deoxidizing metallic ores comprising walls forming a continuous ore heating chamber through which a mixture of ore and carbonaceous material is allowed to settle, said walls having an inlet opening for said heating chamber at the top thereof and an outlet opening for said heating chamber at the bottom thereof, a series of conduits passing through said chamber, and means for passing a heating agent through said conduits which are imperforate so that said heating agent is kept out of Contact with said ore.

2. A kiln for deoxidizing metallic ores comprising walls forming a continuous ore heating chamber through which a mixture of ore and carbonaceous material is allowed to settle, said walls having an inlet opening for said heating chamber at the top thereof and an outlet opening for said heating chamber at the bottom thereof, a series of conduits passing through said chamber, and walls forming a series of fines connecting said conduits to form a passage through which a heating agent is circulated, said passage having gas tight walls and making gas tight joints with said conduits so that said heat-ing agent in no way comes in contact with the material being treated.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 29th day of May, 1918.

WILLIAM WIN KELMAN Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

